Vortex Optics VIPER PST 1-4X24 RIFLESCOPE User Manual

RIFLESCOPE

riflescope Manual

1-4x24 with Uncapped Turrets

RIFLESCOPE

The VorTex® Viper® pSTTm 1-4x24 rifleScope

Specifically designed for the tactical, law enforcement and

committed precision shooting communities, the Viper®PST 1–4x24

riflescopes offer the highest levels of performance and reliability.

With features such as matched turret/reticle subtensions, CRS zero

stop mechanisms and precision ranging reticles, the Viper PSTs are

ready for any situation.

Fast Focus Eyepiece

Illumination

Ocular
Lens

Reticle Focus

Magnification
Adjustment Ring

Adjustment Knob

MagView Indicator

Elevation
Adjustment Knob

Turret Shroud

Dual Use: Shooting Tactical / Hunting
US Patent 7,937,879

Windage Adjustment
Knob

Objective
Lens

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Second Focal Plane Reticle

This PST riflescope model uses a second focal plane (SFP) reticle.

The advantage of a SFP reticle is that it always maintains the same

appearance. Shooters using reticle hashmarks should be aware that

the listed subtensions used for estimating range, holdover, and wind

drift correction are only accurate at the 4x magnification.

The Subtension Scale: MOA or MRAD

Depending on which version you have purchased, your Viper PST

1–4x24 riflescope will feature adjustments and reticles scaled in MOAs

or mrads. If you are unsure of which scale is used, reference the top of

the adjustment turret.

If the adjustment is in MOAs,
the turret will display
“1 Click = 1/2 MOA”.

Both minute-of-angle (MOA) and milliradian (mrad) unit of arc scales

are effective when ranging or adjusting riflescope for bullet trajectory.

If the adjustment is in mrads,
the turret will display
“1 click = .2 mrad”.

RIFLESCOPE

MOA Adjustments

MOA unit of arc measurements are based on degrees and minutes.

There are 360 degrees in a circle and 60 minutes in a degree for a total

of 21,600 minutes (MOA) in a circle. A minute of angle will subtend

1.05 inches at a distance of 100 yards. Viper PST 1–4x24 riflescopes

with MOA adjustments use 1/2-minute clicks which subtend .52 inches

at 100 yards, 1.05 inches at 200 yards, 1.57 inches at 300 yards, etc.

MRAD Adjustments

Mrad unit of arc measurements are based on the radian. A radian is the

angle subtended at the center of a circle by an arc that is equal in length

to the radius of the circle. There are 6.283 radians in all circles and

1000 milliradian in a radian for a total of 6283 milliradians (mrads) in a

circle. An mrad will subtend 3.6 inches at a distance of 100 yards. Viper

PST 1–4x24 riflescopes with mrad adjustments use .2 mrad clicks which

subtend .72 inches at 100 yards, .1.44 inches at 200 yards (4 cm at 200

meters), 2.16 inches at 300 yards (6 cm at 300 meters), etc.

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RIFLESCOPE

rifleScope AdjuSTmenTS

Reticle Focus

Vortex Viper PST riflescopes use a fast focus eyepiece designed to quickly

and easily adjust the focus on the riflescope’s reticle.

To adjust the reticle focus:

1. Look through the riflescope at a

blank white wall or up at the sky.

2. Turn the eyepiece focus knob in

or out until the reticle image is as

crisp as possible.

Adjust the reticle focus.

Note: Try to make this particular adjustment quickly, as the eye will try to

compensate for an out-of-focus reticle.

Once this adjustment is complete, it will not be necessary to re-focus

every time you use the riflescope. However, because your eyesight may

change over time, you should re-check this adjustment periodically.

Warning

Looking directly at the sun through a riflescope, or any optical instrument,

can cause severe and permanent damage to your eyesight.

About Parallax

Windage and Elevation Adjustments

Vortex Viper PST riflescopes incorporate precision finger adjustable elevation

and windage dials with audible clicks.

Elevation

To make adjustments:

1. Turn the adjustment knob in the

appropriate direction: Up/Down or

Left/Right as indicated by the arrows.

2. Following the directional arrows,

turn the knobs in the direction you wish

the bullet’s point-of-impact to go to.

MOA Adjustments

With each click of the Viper PST moving the point-of-impact 1/2 MOA,

it will take two clicks of the knob to move a bullet’s point-of-impact 1.05

inches at a 100 yard sight-in distance.

MRAD Adjustments

With each click of the Viper PST moving the point-of-impact .2 mrad

(.72 inches), two clicks will move the bullet’s point-of-impact 1.44 inches

at a 100 yard sight-in distance. At 100 meters, two clicks will move the

point-of-impact four centimeters.

Knob

Windage Knob

This Viper PST 1-4x24 riflescope does not have a parallax focus and is

factory focussed at a distance of 100 yards. Using good consistent shooting

form and cheek weld when shooting at distances other than 100 yards will

minimize most error problems associated with parallax.

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